Beginner Gardening: something wrong happened to my jasmine in less than a week!, 0 by goofybulb

goofybulb wrote:
I don't know what, but almost all the leaves are gonners, they started by developing a weird reddish/copper-y tint, then discolored towards yellow, and at any slight wind gust or if touched they would fall.
The jasmine I'm talking about is a Chilean Jasmine (mandevilla laxa). I've had it for less than a year, was relatively happy in a sunny location, meaning that the leaves until last week were green and nice, but it never flowered for me though.
I don't see any little buggers on the leaves or under the leaves.
Right now, it has about 3 little branches that still appear to have normal leaves.
What is this? what should I do?
I was thinking of the following possibilities:
- prune it
- check roots/repot
- take those 3 remaining little branches (softwood) as cuttings and trying to root them

Please help!
Goofy